That lullaby is so sweet! It's given me inspiration for my own mlp lullaby! I'm never gonna use it tho. I swear to you that if ever i write a fanfiction i will do a disclaimer saying that your the inspiration behind it and that you get the credit. Here! Have a cookie! (::) XD

This was interesting; it has a "Lion King" vibe to it. I'm still not entirely sure how involved Twilight's parents were after she became Celestia's student, but I think Tia does love Twi like a daughter. But I don't think that she would feel the need to use corporal punishment. I'm not opposed to it per se, but it feels weird for Celestia to use it. But that's just my interpretation of the character.

Y'know, this is pretty much how I've always seen Celestia; firm, but loving. I honestly think that this would be how she would have reacted, had this happened in the show. With that said, this is amazingly-well written, and you did an excellent job keeping all the characters in-character. Heck, this could be canon! So please, do continue, because you have to be one of the BEST authors I've ever seen.